US3282088A - Shock forming machine - Google Patents

Description

SR SEARCH ROOM Nov. l, 1966 3 282 O88 S. C. JOANNOU SHOCK FORMING MACHINE Filed Sept. 9, 1965 SUBSTITUTE FOR Mlssme XR N/ i i: r

:I n;- INVENTOR, STEPHEN C. JOANNOU if-l BY 1 sL M4? ATTOR N EY:

United States Patent 3,282,088 SHOCK FORMING MACHINE Stephen C. Joannou, Elberon, NJ., assignor to the United States of America as represented by the Secretary of the Army Filed Sept. 9, 1963, Ser. No. 307,757 1 Claim. (Cl. 73-71.6)

The invention desc-ribed herein may be manufactured and `used by or for the Government for governmental purposes, without the payment of any royalty thereon.

The invention herein relates to a machine for generating a predetermined motion. More specifically the -primary objective of the machine is to impart a variety of different shaped shock .pulses to `a table or platform upon which there may be mounted particular components, such as electronic equipments, that are to be subjected to shock tests.

In the utilization of many electronic equipments it is necessary that such equipments be tested prior to use to determine the degree of shock that such equipments can be subjected Ito prior to such use.

An important object of the present invention is to provide a machine that is capable of impar-ting a predetermined shock o-r pulse -to an equipment `under controlled conditions.

Another object of t-he invention is to prov-ide a machine for imparting a controlled shock that can be repeatedly reproduced under the exact environmental conditions.

An important feat-ure of the invention is the provision of a machine for the purpose intended, that is relatively small, stable and has a high degree of reliability.

The .invention can best be understood from the following description, to be read in view of the accompanying drawing in which:

' FIGURE l is a side elevational view of the machine, taken on the Iline |1-1 of FIGURE 2, and

FIGURE 2 is an end view, in section, taken on the line 2-2 of FIGURE l.

In the drawings the shock imparting machine is designated generally as 10, and includes two pairs of spaced parallel upright support mem-bers 12, which are preferably of angle iron configuration. The uprights 12, are rigidly affixed to a supporting base 14. Extending between the base 14 and the top of the upright members 12, are brackets 16 which also serve to support and rigidly maintain the upright members. Positioned wit-hin the space defined by the upright members 12 is a table 18 which includes a top 20 and a rectangular shaped base 22 that is centrally affixed to the bottom surface of the top 20 and perpendicular thereto. Rigidly affixed to the respective top and bottom surfaces of the table top 20 are eight sets of iden-tical roller bearing assemblies generally designated as 24 which serve to per-mit vertical, or up and down, movement of the table 18 but prevent any lateral or sidew-ise movement of the table as hereinafter set forth. For purposes of brevity only one of the ybearing assemblies 24 need be described. Such assembly 24 includes an angle support 26, the base portion of which is rigidly secured to the table top. The upright portion carries a right angle shaft having rollers 28, 28A affixed thereon in transverse lrelationship to each other. By such arrange- ICC ment the roller 28 can ride on one surface of the angle iron upright 12, while the other roller 28A ca-n ride on the other surface of said upright. In operative engagement with the base 22, is a cam assembly generally designated as 30, and includes a pair of rectangular shaped cam plates 32, so disposed that the discrete plates rare on either side of the base 22 and .in para-llel alignment therewith. Secured to, and extending from the side surfaces of the base 22 are roller bearings 34, that ride in mutually opposed discre'te disposed slots 36 in the two cam plates 32. The nature lof the slot is critical to the operation of the machine herein, and as can be seen in FIGURE l is, slan-ted, that is, inclined from the Ilead-ing edge of the cam .pla-te to a point adjacent to the far edge of said cam plate. The cam assembly 30 is movable rela-tive to the base 22 and the table 18 by the following means. Affixed to the cam surfaces facing the luprights 12, are bearing plates, one of which is shown at 38. -Each of the plates 38 carry a roller bea-ring 40 that is positioned perpendicular to the plates and 4adapted to ride in an elongated carriage assembly 42 which includes upper and llower slotted guide rails 44, 46 along which the -upper and lower roller bearings 40 will ride. The cams 32, are 'linked at their bottom edges by a cross bar 48 which affords rigidity to the cam assembly and insures uniform m-otion of both cams. Included in the carriage assembly 42 is a decelerating pis-ton 50 which -operates in a manner described in the oper-ation of the machine. A componen-t or equipment to be shock tested is shown in the block 52.

To operate the machine the equipment 52 is afxe-d to the table top 20. The cam assembly as shown in FIG- URE 1 is extended to its extreme .position in the carriage assembly. The cam assembly -is then thrust to the left as seen in FIGURE l. In its travel along the guide rails 44, 46 the roller lbearings 34 affixed to the table base 22 will 4rotate as the cams 32 ride between t-he uprights 12. Due to the upward incline of the slots 36 the table 18 will be raised to a height 4dependent upon the slope of the cam slot. Since the thrust of the cams 32 is very rapid, there will be a resultant very rapid uplift of the table 18 and the component thereon. Such sudden shock will be translated to the equipment. Any conventional thrusting or driving force can be utilized on moving the cams 32. Thus for example, the cams can be spring loaded, or provided with a pneumatic or propellant device 4to effect their movement. The lpiston 50 Will serve as an arresting mechanism to stop further movement of the cams after any desired length of travel. It will be apparent that the slope of the slots 36 in the cam plates can be varied'to any desired degree to secure greater movement of the table 18 and acquire varied pulse or `shock movements.

What is claimed is:

A shock imparting machine comprising a plurality of L-shaped `uprights fixed-ly attached to a horizontally elongated framework, an equipment support member slidably mounted within said uprights, said support member having a surface top and a base portion extending downwardly therefrom, means affixed to said surface top and in operative engagement with said uprights to permit vertical movement of said support member within said uprights and restrain the support member from lateral movement relative to said vertical movement, a `plurality of 3 4 roller bearings extending perpendiculai-ly from the base References Cited by the Examiner portion of said support member, a substantially U-shaped UNITED STATES PATENTS cam assembly comprising a palr of elongated plates and a connecting cross 4bar that surrounds said base portion, 311061840 10/1963 Befsch 73-71-6 said elongated plates having parallel inclined slots in 5 OTHER REFERENCES ea-ch of said plates Within which .the roller bearings of said base are engaged, a second set of roller bearings eX- tending perpendicularly from said elongated plates adapted to travel in said framework whereby when said cam assembly is rapidly thrust along `said framework said 10 RICHARD C' QUEISSER Pnmmy Exammer support assembly will be Irapidly elevated. J. JOSEPH SMITH, JR., Assistant Examiner.

Ailbert and Rogers, Kinematics of Machinery, Wiley and Sons, Inc., New York, 1931, pages 125-129 relied upon.

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